flooding downstream and ever since that work has been done this happens to us at least once or twice a year. >> not far away this morning heavy downpour turned this creek one that was barely back three days ago that a fast moving father way. overflow the bank near office complex on north mcdowell boulevard. >> about 4 and a half feet from yesterday. yesterday we were seeing ground grass and puddles whereas the ground was saturated. if you can believe the prediction of the rain that we are supposed to get, this will flood. >>reporter: those who haven't had the water encroach on them yet are doing what they can to make sure it doesn't. next round of heavy rain line up off the coast. rob works for rerefrigeration company on north petaluma boulevard sits in a low spot near the petaluma river. the property hasn't flooded in years. but there's concern. it might if the forecast for this weekend holds true. >> well they are saying it's to be 7 foot high in the river, river right back behind us hear and about eight years ago the river overflowed at 7 and a half feet so we don't want, if it'